[cairo] patch for the out-of-the-source-tree builds of cairo

[Tomasz Cholewo]

Building cairo in a directory separate from the source fails because the
generated header cairo-features.h is not on any include path when
compiling files in the cairo/test subdirectory.  The attached proposed
patch adds $(top_builddir)/src to the header search path.  I also attach
a make log showing the error.

Regards,
  Tomasz Cholewo
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